US4164528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing metal nitride sintered moldings
Assignee: Research Institute for Iron Steel and Other Metals of Tohoku University
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Filing: 1976-10-08
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Granted: 1979-08-14
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Expires: 1996-10-08
Abstract
Abstract Metal nitride sintered moldings are produced by mixing metal nitride powders with an organosilicon compound or an organosilicon high molecular weight compound as a binder, molding the mixture into a desired shape and heating the formed molding under a non-oxidizing atmosphere to sinter the metal nitride powders.
Inventors
- 👤 Seishi Yajima
- 👤 Josaburo Hayashi
- 👤 Mamoru Omori
- 👤 Hideo Kayano
- 👤 Masaaki Hamano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316; C04B35/515; C04B35/58; C04B35/581; C04B35/584; C04B35/589; C04B35/593; C04B41/00; C04B41/009; C04B41/45; C04B41/46; C04B41/49; C04B41/4905; C04B41/80; C04B41/81; C04B41/82; C04B41/84
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A method for producing metal nitride sintered moldings, which comprises mixing metal nitride powders with 0.3-45 percent by weight of a binder consisting essentially of organosilicon high molecular weight compounds having silicon and carbon as the main skeleton components, which have been produced through polycondensation reaction of polydimethylsilanes, molding the resulting mixture into a desired shape and heating the molding at a temperature of 800°-2200° C. under at least one atmosphere selected from the group consisting of vacuum, inert gas, CO gas and hydrogen gas to form metal nitride sintered molding.
Claim 2
Independent Claim
91 words
A method for producing metal nitride sintered moldings, which comprises mixing metal nitride powders with 0.3-45 percent by weight of a binder consisting essentially of organosilicon high molecular weight compounds having silicon and carbon as the main skeleton components, which have been produced through polycondensation reaction of polydimethylsilanes, molding the resulting mixture into a desired shape and heating the molding at a temperature of 800°-2200° C. under at least one atmosphere selected from the group consisting of vacuum, inert gas, CO gas and hydrogen gas to form metal nitride sintered molding.
Claim 3
Dependent Claim
37 words
The method as claimed in claim 1 wherein the formed metal nitride sintered molding is heated at a temperature of 800°-1,400° C. under an oxidizing atmosphere to remove free carbon contained in the metal nitride sintered molding.
Claim 4
Dependent Claim
30 words
The method as claimed in claim 1, wherein the mixture of metal nitride powders and the binder is press molded by a hot press process, during which sintering is effected.
Claim 5
Dependent Claim
56 words
The method as claimed in claim 1, wherein the formed metal nitride sintered molding is impregnated with a liquid form of the organosilicon high molecular weight compound under a reduced pressure and then the impregnated metal nitride sintered molding is heated under at least one atmosphere of vacuum, an inert gas, CO gas and hydrogen gas.
Claim 6
Dependent Claim
23 words
The method as claimed in claim 4, wherein the successive treatment of the impregnation and the heating is repeated two or more times.
Claim 7
Dependent Claim
30 words
The method as claimed in claim 4, wherein the liquid form of the organosilicon compound or organosilicon high molecular weight compound is formed by dissolving said compound in a solvent.
Claim 8
Dependent Claim
18 words
The method as claimed in claim 1, wherein said metal nitride is Si 3 N 4 or AlN.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |